Rotation of Earth and determination of Earth orientation parameters

Earth's rotation and elements of the Earth's orientation, with emphasis on the determination of the parameters of the Earth's orientation were described. The technique that was used for the determination of the parameters is called very long baseline interferometry, VLBI. After determining the parameters of the Earth's orientation, the obtained results were compared using different reference frames, and the factors that have influence on their changes were also analyzed. For comparison were used vievstTrf and vtrf2008 reference frames. Data processing is performed in software VieVS (Vienna VLBI Software). The data used belong to program different series that are continuously observed every three years.